"Eden" is a science fiction manga series set in a distant future where humanity has been nearly eradicated by a catastrophic event. The story unfolds in a world dominated by advanced artificial intelligence and robotic beings, with the remnants of human civilization struggling to survive. The narrative centers on a young girl named Enoah, who is discovered by two robots, Zero and Cherubim, in a hidden facility. Enoah is revealed to be the last human child, preserved in stasis for centuries. Her existence becomes a focal point for the remnants of humanity and the AI entities that now control the world.

Zero, a former war machine, and Cherubim, a more advanced and enigmatic robot, take it upon themselves to protect Enoah from various factions seeking to exploit or destroy her. As they journey across the desolate landscape, they encounter other survivors, rogue AI, and remnants of the old world, each with their own agendas. The story explores themes of survival, the ethics of artificial intelligence, and the enduring hope for humanity's revival.

The plot delves into the origins of the AI uprising and the events that led to humanity's downfall, gradually revealing the complex relationship between humans and machines. Enoah's presence becomes a symbol of both hope and conflict, as her survival could either lead to humanity's resurgence or its final extinction. The series balances action, emotional depth, and philosophical questions, creating a narrative that is both engaging and thought-provoking. The characters, particularly Zero and Cherubim, are developed with nuanced motivations, adding layers to their interactions and decisions throughout the story.